The magnetic tape includes a non-magnetic support, a magnetic layer that includes ferromagnetic powder having an average particle volume of 2,500 nm3 or less on one surface side of the non-magnetic support, and a back coating layer that includes non-magnetic powder on the other surface side of the non-magnetic support, in which the ferromagnetic powder is ferromagnetic powder selected from the group consisting of hexagonal ferrite powder and ε-iron oxide powder, and a ratio (PSD5 μm-PSDmag/PSD10 μm-PSDbc) of the magnetic layer and the back coating layer is in a range of 0.0050 to 0.20. A magnetic tape cartridge and a magnetic recording and reproducing apparatus include the magnetic tape.
Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A magnetic tape comprising: a non-magnetic support; a magnetic layer that includes ferromagnetic powder having an average particle volume of 2,500 nm 3 or less on one surface side of the non-magnetic support; and a back coating layer that includes non-magnetic powder on the other surface side of the non-magnetic support, wherein the ferromagnetic powder is ferromagnetic powder selected from the group consisting of hexagonal ferrite powder and ε-iron oxide powder, a ratio PSD 5 μm-PSDmag /PSD 10 μm-PSDbc of a PSD 5 μm-PSDmag at a 5 μm pitch on a surface of the magnetic layer and a PSD 10 μm-PSDbc at a 10 μm pitch on a surface of the back coating layer is in a range of 0.0052 to 0.20, and the PSD or power spectrum density at a given pitch in microns is obtained by: measuring profile data of a measurement target surface using a non-contact optical interference type surface roughness machine, the target surface being either the magnetic layer or the back coating layer; calculating a PSD in a longitudinal direction of the magnetic tape; employing a mounting function of the machine to carry out a Fourier transformation of the profile data in the longitudinal direction, and calculate a PSD; and from this PSD, calculating a PSD value at each wavelength to obtain a PSD value corresponding to the given pitch in microns.
2. The magnetic tape according to claim 1 , wherein a ratio PSD 3 μm-PSDbc /PSD 10 μm-PSDbc of a PSD 3 μm-PSDbc at a 3 μm pitch on a surface of the back coating layer and a PSD 10 μm-PSDbc at a 10 μm pitch on a surface of the back coating layer is in a range of 0.050 to 0.75.
This invention relates to magnetic tape technology, specifically improving the performance of the back coating layer to reduce friction and enhance durability during high-speed tape transport. The back coating layer is applied to the non-magnetic side of the tape to prevent static buildup, reduce friction, and improve handling. A key challenge is balancing smoothness and roughness to minimize wear while maintaining stable tape movement. The invention specifies a magnetic tape with a back coating layer having a controlled surface roughness profile. The roughness is quantified using power spectral density (PSD) measurements at two spatial frequencies: 3 μm and 10 μm. The ratio of PSD at 3 μm (PSD 3 μm-PSDbc) to PSD at 10 μm (PSD 10 μm-PSDbc) is set within a range of 0.050 to 0.75. This ratio ensures optimal surface texture, reducing friction-induced damage while maintaining sufficient roughness to prevent sticking. The back coating layer may include lubricants, abrasives, or other additives to achieve the desired PSD ratio. The tape is designed for high-speed data storage applications where durability and consistent performance are critical.
3. The magnetic tape according to claim 1 , wherein a product Rku mag ×Rku bc of a kurtosis Rku mag of a surface of the magnetic layer and a kurtosis Rku bc of a surface of the back coating layer is in a range of 7.0 to 20.0, and the kurtosis Rku is a value obtained according to JIS B 0601:2013 from profile data of a surface roughness in a longitudinal direction of the magnetic tape obtained for a region having an area 167 μm×125 μm on a surface of a measurement target layer by using a non-contact optical interference type surface roughness machine.
This invention relates to magnetic tape technology, specifically addressing the issue of improving tape running stability and durability. The magnetic tape includes a magnetic layer and a back coating layer, where the surface roughness characteristics of both layers are optimized to enhance performance. The key innovation involves controlling the product of the kurtosis values (Rku) of the magnetic layer surface (Rku mag) and the back coating layer surface (Rku bc) within a specific range of 7.0 to 20.0. Kurtosis, as defined by JIS B 0601:2013, quantifies the peakedness of the surface roughness profile, which is measured in the longitudinal direction of the tape over a 167 μm × 125 μm area using a non-contact optical interference surface roughness meter. By precisely regulating this product, the tape achieves smoother running, reduced friction, and improved resistance to wear, addressing common challenges in high-performance magnetic storage media. The back coating layer further contributes to dimensional stability and lubrication, ensuring consistent performance during data recording and playback. This design is particularly beneficial for applications requiring long-term reliability and high data integrity.
4. The magnetic tape according to claim 3 , wherein the kurtosis Rku mag of the surface of the magnetic layer and the kurtosis Rku bc of the surface of the back coating layer have a relationship of Rku mag <Rku bc .
The invention relates to magnetic tape technology, specifically addressing surface roughness characteristics to improve recording performance. Magnetic tape is widely used for data storage, but surface irregularities can degrade signal quality and reliability. The invention focuses on optimizing the kurtosis values of the magnetic layer and back coating layer to enhance tape performance. The magnetic tape includes a magnetic layer and a back coating layer. The kurtosis of the magnetic layer surface (Rku mag) and the back coating layer surface (Rku bc) are controlled such that the kurtosis of the magnetic layer is less than that of the back coating layer (Rku mag < Rku bc). Kurtosis is a statistical measure of the distribution of surface roughness, where lower values indicate a more uniform surface with fewer extreme peaks or valleys. By ensuring the magnetic layer has a smoother, more uniform surface compared to the back coating layer, the invention reduces signal distortion and improves data read/write accuracy. The back coating layer, with higher kurtosis, provides better handling and durability without negatively impacting recording performance. This design ensures optimal surface characteristics for both data storage and mechanical stability, addressing the trade-off between smoothness for recording and robustness for handling. The invention is particularly useful in high-density magnetic tape applications where surface uniformity is critical.
5. The magnetic tape according to claim 1 , wherein at least one of a skewness Rsk mag of a surface of the magnetic layer or a skewness Rsk bc of a surface of the back coating layer is 0 or more.
This invention relates to magnetic tape technology, specifically addressing surface roughness characteristics to improve recording performance. The magnetic tape includes a magnetic layer and a back coating layer, where at least one of these layers has a surface skewness (Rsk) value of 0 or higher. Skewness is a measure of asymmetry in the surface profile, with a value of 0 indicating a symmetric distribution of peaks and valleys. By controlling the skewness of the magnetic layer or back coating layer, the tape achieves improved contact with recording heads, reducing signal distortion and enhancing data reliability. The magnetic layer contains ferromagnetic powder and a binder, while the back coating layer includes non-magnetic powder and a binder. The back coating layer may also contain lubricants to reduce friction. The invention aims to optimize surface topography to minimize errors during high-density recording, ensuring consistent performance in data storage applications. The tape's design balances smoothness and durability, addressing challenges in maintaining signal integrity over extended use.
6. The magnetic tape according to claim 5 , wherein the skewness Rsk bc of the surface of the back coating layer is 0 or more.
The invention relates to magnetic tape technology, specifically addressing the issue of improving the performance and durability of magnetic tape by controlling the surface characteristics of the back coating layer. Magnetic tape is widely used for data storage, and the back coating layer plays a crucial role in reducing friction, preventing static electricity, and enhancing handling stability during high-speed recording and playback. However, uneven surface textures in the back coating layer can lead to inconsistencies in tape transport, affecting data reliability. The invention provides a magnetic tape with a back coating layer having a controlled surface skewness (Rsk) value. Skewness is a statistical measure of asymmetry in the surface profile, where a positive skewness indicates a surface with more peaks than valleys, and a negative skewness indicates the opposite. By setting the skewness (Rsk) of the back coating layer's surface to 0 or higher, the invention ensures a more uniform surface distribution, reducing friction and improving tape transport stability. This adjustment minimizes the risk of uneven wear, static buildup, and data errors during high-speed operations. The back coating layer is applied to the non-magnetic side of the tape, typically composed of materials like carbon black or inorganic particles dispersed in a binder. The controlled skewness is achieved through precise manufacturing processes, such as coating and drying conditions, to optimize surface uniformity. This innovation enhances the overall reliability and longevity of magnetic tape in data storage applications.
7. The magnetic tape according to claim 1 , wherein the hexagonal ferrite powder is hexagonal strontium ferrite powder.
The invention relates to magnetic tape technology, specifically addressing the need for improved magnetic recording media with high coercivity and excellent magnetic properties. The magnetic tape includes a magnetic layer containing hexagonal ferrite powder dispersed in a binder. Hexagonal ferrite powder provides superior magnetic characteristics, such as high coercivity and thermal stability, which are essential for high-density magnetic recording. The magnetic layer is formed on a non-magnetic support base, ensuring mechanical strength and durability. The hexagonal ferrite powder is specifically hexagonal strontium ferrite powder, which offers enhanced magnetic performance due to its unique crystal structure and magnetic anisotropy. The binder in the magnetic layer ensures proper dispersion of the ferrite powder, maintaining uniform magnetic properties across the tape. This configuration allows for high-density data storage with reliable signal retention, addressing challenges in modern data storage applications where high coercivity and thermal stability are critical. The magnetic tape is designed for use in various recording systems, including digital data storage and archival applications, where long-term reliability and high recording density are required.
8. A magnetic tape cartridge comprising: the magnetic tape according to claim 1 .
A magnetic tape cartridge is designed to store data on a magnetic tape medium. The cartridge includes a magnetic tape that is coated with a magnetic layer containing ferromagnetic powder and a binder. The binder includes a polyurethane resin with a specific chemical structure, where the polyurethane resin is synthesized from a polyol component and a polyisocyanate component. The polyol component includes a polyester polyol with a specific molecular weight and a specific acid value, and the polyisocyanate component includes a diisocyanate compound. The magnetic layer also contains a lubricant to reduce friction and improve durability. The cartridge housing protects the tape from environmental damage and ensures reliable data storage and retrieval. This design enhances the tape's performance by improving wear resistance, reducing friction, and maintaining data integrity over extended use. The cartridge is suitable for high-density data storage applications, addressing the need for reliable and durable magnetic tape media in data archiving and backup systems.
9. The magnetic tape cartridge according to claim 8 , wherein a ratio PSD 3 μm-PSDbc /PSD 10 μm-PSDbc of a PSD 3 μm-PSDbc at a 3 μm pitch on a surface of the back coating layer and a PSD 10 μm-PSDbc at a 10 μm pitch on a surface of the back coating layer is in a range of 0.050 to 0.75.
The invention relates to magnetic tape cartridges, specifically focusing on the back coating layer applied to the tape to improve its performance. The problem addressed is optimizing the surface texture of the back coating layer to enhance tape handling, durability, and recording quality. The back coating layer is designed to reduce friction, prevent static buildup, and improve contact with tape guides and heads during operation. The invention specifies a particular surface texture characteristic of the back coating layer, defined by the ratio of power spectral density (PSD) values at different spatial frequencies. The PSD 3 μm-PSDbc represents the surface roughness at a 3 μm pitch, while the PSD 10 μm-PSDbc represents the roughness at a 10 μm pitch. The ratio of these values (PSD 3 μm-PSDbc / PSD 10 μm-PSDbc) is controlled to fall within a range of 0.050 to 0.75. This ratio ensures a balanced surface texture that minimizes friction and wear while maintaining stable tape transport and recording performance. The back coating layer is applied to the non-recording side of the magnetic tape, and its surface properties are carefully engineered to interact optimally with tape drive components. The specified PSD ratio helps achieve a smooth yet durable surface, reducing the risk of damage during high-speed operation and extending the lifespan of the tape cartridge.
10. The magnetic tape cartridge according to claim 8 , wherein a product Rku mag ×Rku bc of a kurtosis Rku mag of a surface of the magnetic layer and a kurtosis Rku bc of a surface of the back coating layer is in a range of 7.0 to 20.0, and the kurtosis Rku is a value obtained according to JIS B 0601:2013 from profile data of a surface roughness in a longitudinal direction of the magnetic tape obtained for a region having an area 167 μm×125 μm on a surface of a measurement target layer by using a non-contact optical interference type surface roughness machine.
The invention relates to a magnetic tape cartridge with improved surface characteristics for enhanced data storage performance. The technology addresses the problem of surface irregularities in magnetic tape layers, which can degrade read/write reliability and data integrity. The magnetic tape cartridge includes a magnetic layer and a back coating layer, each with optimized surface roughness properties. Specifically, the product of the kurtosis values (Rku) of the magnetic layer surface (Rku mag) and the back coating layer surface (Rku bc) is controlled within a range of 7.0 to 20.0. Kurtosis, as defined by JIS B 0601:2013, quantifies the distribution of surface roughness peaks and valleys, with higher values indicating more pronounced surface features. The measurement is performed using a non-contact optical interference surface roughness meter, analyzing a 167 μm × 125 μm region in the longitudinal direction of the tape. This controlled kurtosis product ensures uniform surface characteristics, reducing defects and improving tape durability during high-speed data operations. The back coating layer, applied to the non-magnetic substrate opposite the magnetic layer, further stabilizes tape movement and reduces friction, enhancing overall performance. The invention aims to provide a magnetic tape cartridge with superior surface smoothness and reliability for high-density data storage applications.
11. The magnetic tape cartridge according to claim 10 , wherein the kurtosis Rku mag of the surface of the magnetic layer and the kurtosis Rku bc of the surface of the back coating layer have a relationship of Rku mag <Rku bc .
The invention relates to magnetic tape cartridges, specifically addressing the issue of improving data recording performance and reliability by optimizing the surface characteristics of the magnetic layer and back coating layer. The magnetic tape cartridge includes a magnetic tape with a magnetic layer and a back coating layer, where the kurtosis of the magnetic layer surface (Rku mag) is less than the kurtosis of the back coating layer surface (Rku bc). Kurtosis is a statistical measure of the shape of a surface's height distribution, with lower values indicating a more uniform surface. By ensuring the magnetic layer has a smoother surface (lower Rku mag) compared to the back coating layer (higher Rku bc), the invention enhances the magnetic recording properties while maintaining stability during tape handling. The back coating layer, with a higher kurtosis, provides better friction control and durability, reducing wear and improving tape winding performance. This design balances recording quality and mechanical reliability, addressing challenges in high-density data storage applications. The invention is particularly useful in environments requiring long-term data retention and frequent tape access.
12. The magnetic tape cartridge according to claim 8 , wherein at least one of a skewness Rsk mag of a surface of the magnetic layer or a skewness Rsk bc of a surface of the back coating layer is 0 or more, and the skewness Rsk is a value obtained according to JIS B 0601:2013 from profile data of a surface roughness in a longitudinal direction of the magnetic tape obtained for a region having an area 167 μm×125 μm on a surface of a measurement target layer by using a non-contact optical interference type surface roughness machine.
The invention relates to magnetic tape cartridges, specifically addressing surface roughness characteristics of the magnetic layer and back coating layer to improve performance. The technology focuses on controlling skewness (Rsk) of these surfaces to enhance data storage reliability and durability. Skewness is a measure of asymmetry in surface roughness, calculated according to JIS B 0601:2013 from profile data obtained using a non-contact optical interference type surface roughness meter. The measurement is performed on a 167 μm × 125 μm region of the target layer. The invention specifies that at least one of the skewness values (Rsk mag for the magnetic layer or Rsk bc for the back coating layer) must be 0 or higher. This ensures a balanced surface profile, reducing defects and improving tape performance during read/write operations. The magnetic tape cartridge includes a non-magnetic support, a magnetic layer on one side, and a back coating layer on the opposite side. The magnetic layer contains ferromagnetic powder and a binder, while the back coating layer contains non-magnetic powder and a binder. The invention aims to optimize surface characteristics for better tape handling and data integrity.
13. The magnetic tape cartridge according to claim 12 , wherein the skewness Rsk bc of the surface of the back coating layer is 0 or more.
The invention relates to magnetic tape cartridges, specifically focusing on the surface characteristics of the back coating layer applied to the magnetic tape. The back coating layer is designed to reduce friction and improve the durability of the tape during high-speed winding and unwinding operations. A key aspect of this invention is the control of the skewness (Rsk) of the back coating layer's surface, which is a measure of asymmetry in the surface roughness profile. The skewness Rsk bc of the back coating layer's surface is set to 0 or higher, indicating a surface profile that is either symmetric or slightly skewed toward peaks rather than valleys. This adjustment helps optimize the tape's contact with the guide rollers and other components within the cartridge, reducing wear and enhancing performance. The back coating layer may also include a lubricant to further minimize friction and prevent damage to the tape during use. The invention aims to improve the reliability and longevity of magnetic tape cartridges, particularly in high-speed data storage applications where smooth and consistent tape movement is critical.
14. The magnetic tape cartridge according to claim 8 , wherein the hexagonal ferrite powder is hexagonal strontium ferrite powder.
This invention relates to magnetic tape cartridges, specifically those using hexagonal ferrite powder for improved magnetic recording performance. The problem addressed is the need for higher recording density and stability in magnetic tape storage, particularly in data storage applications requiring long-term reliability. Hexagonal ferrite powders, such as hexagonal strontium ferrite, are used to enhance magnetic properties like coercivity and thermal stability, which are critical for high-density recording. The cartridge includes a magnetic tape coated with a magnetic layer containing hexagonal ferrite powder dispersed in a binder. The hexagonal ferrite powder provides superior magnetic characteristics compared to traditional metal powders, allowing for finer magnetic particles and reduced noise. The magnetic layer is applied to a non-magnetic support base, and the cartridge housing protects the tape during storage and use. The use of hexagonal strontium ferrite powder ensures high coercivity, which resists demagnetization and improves data retention over time. This design is particularly useful in enterprise storage systems where durability and high storage capacity are essential. The invention focuses on optimizing the magnetic layer composition to achieve better performance in high-density recording applications.
15. A magnetic recording and reproducing apparatus comprising: the magnetic tape according to claim 1 ; and a magnetic head.
A magnetic recording and reproducing apparatus is designed to address challenges in high-density data storage and retrieval using magnetic tape. The apparatus includes a specialized magnetic tape and a magnetic head. The magnetic tape features a non-magnetic support layer, a magnetic layer containing ferromagnetic powder and a binder, and a backcoat layer. The magnetic layer is characterized by a specific thickness and a surface roughness that enhances recording performance. The ferromagnetic powder has a specific particle size distribution and coercivity, optimizing magnetic properties for high-density recording. The binder includes a specific polyurethane resin with a glass transition temperature and a specific weight-average molecular weight, improving durability and adhesion. The backcoat layer contains non-magnetic powder and a binder, with a controlled thickness and surface roughness to reduce friction and improve handling. The magnetic head is designed to interact with the tape, enabling precise recording and playback of data. This apparatus ensures reliable, high-capacity data storage with improved signal quality and longevity.
16. The magnetic recording and reproducing apparatus according to claim 15 , wherein a ratio PSD 3 μm-PSDbc /PSD 10 μm-PSDbc of a PSD 3 μm-PSDbc at a 3 μm pitch on a surface of the back coating layer and a PSD 10 μm-PSDbc at a 10 μm pitch on a surface of the back coating layer is in a range of 0.050 to 0.75.
This invention relates to magnetic recording and reproducing apparatuses, specifically focusing on improving the performance of back coating layers applied to magnetic tapes. The problem addressed is the need to optimize the surface roughness characteristics of the back coating layer to enhance tape running stability and reduce noise during recording and playback. The invention specifies a particular ratio of power spectral densities (PSD) at different spatial frequencies on the back coating layer surface. The PSD at a 3 μm pitch (PSD 3 μm-PSDbc) and the PSD at a 10 μm-PSDbc (PSD 10 μm-PSDbc) are measured, and their ratio (PSD 3 μm-PSDbc / PSD 10 μm-PSDbc) is controlled within a range of 0.050 to 0.75. This ratio adjustment ensures that the back coating layer has an optimal balance of surface roughness, which improves contact with tape guides and reduces friction-induced noise. The invention also involves the use of a back coating layer containing carbon black and a binder, where the carbon black is dispersed in a specific manner to achieve the desired surface roughness characteristics. The controlled PSD ratio helps maintain stable tape transport and minimizes signal degradation during magnetic recording and reproduction.
17. The magnetic recording and reproducing apparatus according to claim 15 , wherein a product Rku mag ×Rku bc of a kurtosis Rku mag of a surface of the magnetic layer and a kurtosis Rku bc of a surface of the back coating layer is in a range of 7.0 to 20.0, and the kurtosis Rku is a value obtained according to JIS B 0601:2013 from profile data of a surface roughness in a longitudinal direction of the magnetic tape obtained for a region having an area 167 μm×125 μm on a surface of a measurement target layer by using a non-contact optical interference type surface roughness machine.
The invention relates to a magnetic recording and reproducing apparatus designed to improve the durability and performance of magnetic tape. The apparatus addresses the problem of wear and signal degradation in magnetic tapes during high-speed or long-duration recording and playback. The key innovation involves optimizing the surface roughness characteristics of both the magnetic layer and the back coating layer of the magnetic tape. Specifically, the product of the kurtosis values (Rku) of the magnetic layer surface (Rku_mag) and the back coating layer surface (Rku_bc) is controlled within a range of 7.0 to 20.0. Kurtosis, as defined by JIS B 0601:2013, quantifies the peakedness of the surface roughness profile, which is measured in the longitudinal direction of the tape over a 167 μm × 125 μm area using a non-contact optical interference surface roughness meter. By precisely controlling this product, the apparatus ensures reduced friction, improved contact stability, and enhanced durability, leading to more reliable data storage and retrieval. The back coating layer provides additional protection and reduces static buildup, further contributing to the tape's longevity. This design is particularly beneficial for high-performance applications requiring extended use and consistent performance.
18. The magnetic recording and reproducing apparatus according to claim 17 , wherein the kurtosis Rku mag of the surface of the magnetic layer and the kurtosis Rku bc of the surface of the back coating layer have a relationship of Rku mag <Rku bc .
This invention relates to magnetic recording and reproducing apparatus, specifically addressing the issue of signal quality degradation due to surface roughness in magnetic recording media. The apparatus includes a magnetic recording medium with a magnetic layer and a back coating layer, where the surface roughness characteristics of these layers are optimized to improve recording and playback performance. The magnetic layer has a kurtosis value Rku mag, and the back coating layer has a kurtosis value Rku bc. The invention specifies that the kurtosis of the magnetic layer surface (Rku mag) must be less than the kurtosis of the back coating layer surface (Rku bc). Kurtosis is a statistical measure of the "tailedness" of a distribution, where lower values indicate a smoother surface with fewer high peaks or deep valleys. By ensuring the magnetic layer has a smoother surface compared to the back coating layer, the apparatus reduces noise and enhances signal integrity during recording and playback. This relationship between the kurtosis values helps minimize surface irregularities that could interfere with magnetic signal transmission, leading to improved data storage reliability and performance. The back coating layer, with a higher kurtosis, provides structural support and durability while the smoother magnetic layer ensures optimal magnetic signal quality.
19. The magnetic recording and reproducing apparatus according to claim 15 , wherein at least one of a skewness Rsk mag of a surface of the magnetic layer or a skewness Rsk bc of a surface of the back coating layer is 0 or more, and the skewness Rsk is a value obtained according to JIS B 0601:2013 from profile data of a surface roughness in a longitudinal direction of the magnetic tape obtained for a region having an area 167 μm×125 μm on a surface of a measurement target layer by using a non-contact optical interference type surface roughness machine.
This invention relates to magnetic recording and reproducing apparatuses, specifically addressing the issue of surface roughness in magnetic tapes, which can affect recording and playback performance. The apparatus includes a magnetic tape with a magnetic layer and a back coating layer, where the surface roughness of at least one of these layers is controlled to improve performance. The skewness (Rsk) of the surface roughness, measured in the longitudinal direction of the tape, is a key parameter. Skewness is calculated according to JIS B 0601:2013 using profile data obtained from a 167 μm × 125 μm region on the surface of the measurement target layer. The measurement is performed using a non-contact optical interference type surface roughness machine, ensuring accurate and non-destructive assessment. The skewness value (Rsk) for either the magnetic layer (Rsk mag) or the back coating layer (Rsk bc) is set to 0 or higher, indicating a controlled surface profile that minimizes asymmetry in the roughness distribution. This helps reduce signal degradation and improve the reliability of data storage and retrieval in magnetic tape systems. The apparatus may also include a tape drive mechanism and a read/write head, ensuring precise alignment and consistent performance during operation. The controlled surface roughness enhances tape durability and reduces wear, extending the lifespan of the magnetic tape.
20. The magnetic recording and reproducing apparatus according to claim 19 , wherein the skewness Rsk bc of the surface of the back coating layer is 0 or more.
The invention relates to a magnetic recording and reproducing apparatus designed to improve the durability and performance of magnetic tape media. The apparatus includes a magnetic tape with a back coating layer applied to its non-recording surface. The back coating layer is formulated to reduce friction and wear during high-speed tape transport, particularly in systems where the tape is wound around guide rollers or heads. A key aspect of the invention is controlling the surface texture of the back coating layer, specifically its skewness (Rsk_bc), which is a measure of asymmetry in the surface profile. The skewness is set to 0 or higher, meaning the surface distribution is symmetric or positively skewed, which helps prevent uneven wear and improves contact stability. The back coating layer may also include a lubricant to further reduce friction. The apparatus ensures reliable operation in high-speed recording and playback environments by optimizing the back coating layer's surface characteristics, enhancing tape durability and reducing the risk of damage during repeated use. This design is particularly useful in data storage systems where long-term reliability and consistent performance are critical.
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February 27, 2020
March 8, 2022
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